污水处理厂的水质监测采集的水样主要有以下几种:平均污水样,定时污水样,混合污水样和()。
A、周期污水样
B、日平均污水样
C、事故污水样
D、瞬时污水样
参考答案:D
It is the prevention of disease ______ its successful treatment that has led to the rapid increase of the
world's population. [ ]
A. rather than
B. more than
C. other than
D. less than
播种式DAS拣货,一个拣货员一次只能进行一种货品的拣选。